Pendulum Wave Demonstration Kit w/Teacher's Guide

Bought it for my nephew and he loves it. Purchased this particular one for the price, kind of in the middle. It arrived in perfect condition.

Every time kids used it, it was tangled within the first 5 minutes, and then took an hour or two to untangle. Very frustrating. I even tried cutting off every other string, so there would be fewer strings to get tangled, but everything still got tangled within a few minutes. Poorly designed, so it is essentially worthless. Don't waste your money!

Garbage product!!!!! What a waste. It came partially damaged and after using it once it completely fell apart. I contacted the seller and said it had passed the 30 day return. I guess it’s only supposed to work for one month!!!! Do not buy this.